I'd honestly let him read what she likes when she is with him, and read him what you like when he is with you.

Maybe email his teacher and get her opinion on the matter. That way, if you do want to push the issue with stepmom, you have more to back up your argument.

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Kristen
Middle school teacher by day, super mom by night
Mommy to The Boss~2007, The Energizer Bunny~2009, and The Princess~2011
My kids are no longer in diapers, but somehow, my computer keeps finding its way back here...